From: Dr. Stephen Henson <steve@openssl.org>
Date: Thu, 16 Apr 2015 15:43:09 +0000 (+0100)
Subject: Fix encoding bug in i2c_ASN1_INTEGER
X-Git-Tag: OpenSSL_1_1_0-pre1~1309
X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff_plain;h=a0eed48d37a4b7beea0c966caf09ad46f4a92a44

Fix encoding bug in i2c_ASN1_INTEGER

Fix bug where i2c_ASN1_INTEGER mishandles zero if it is marked as
negative.

Thanks to Huzaifa Sidhpurwala <huzaifas@redhat.com> and
Hanno Böck <hanno@hboeck.de> for reporting this issue.

Reviewed-by: Rich Salz <rsalz@openssl.org>
---

diff --git a/crypto/asn1/a_int.c b/crypto/asn1/a_int.c
index f7f90ff901..3920d5ce96 100644
--- a/crypto/asn1/a_int.c
+++ b/crypto/asn1/a_int.c
@@ -125,6 +125,8 @@ int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
     else {
         ret = a->length;
         i = a->data[0];
+        if (ret == 1 && i == 0)
+            neg = 0;
         if (!neg && (i > 127)) {
             pad = 1;
             pb = 0;
@@ -163,7 +165,7 @@ int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp)
         p += a->length - 1;
         i = a->length;
         /* Copy zeros to destination as long as source is zero */
-        while (!*n) {
+        while (!*n && i > 1) {
             *(p--) = 0;
             n--;
             i--;
@@ -418,7 +420,7 @@ ASN1_INTEGER *BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
         ASN1err(ASN1_F_BN_TO_ASN1_INTEGER, ERR_R_NESTED_ASN1_ERROR);
         goto err;
     }
-    if (BN_is_negative(bn))
+    if (BN_is_negative(bn) && !BN_is_zero(bn))
         ret->type = V_ASN1_NEG_INTEGER;
     else
         ret->type = V_ASN1_INTEGER;